Abstract
Six published cetane indices were comparatively evaluated using a per cent predictability method, which was both rigorous and practical. The conventional linear regression analysis method was also employed. The indices evaluated included ASTM D976-80, ASTM D4737-87 (the proposed replacement of ASTM D976-80), the National Research Council of Canada (NRCC) cetane index, the Canadian General Standards Board cetane index (CGSB), the Calculated Carbon Aromaticity Index (CCAI), and the Ethyl equation. The fuel set, which was obtained from a worldwide survey, comprised 63 fuels and included only those fuels that met the application range specified by ASTM D4737-87 (the index which was most restrictive towards fuel properties). Cetane numbers of the fuels ranged from ≈ 45 to 57, with one fuel having a cetane number of 37. For the fuel set examined, based on the criteria imposed for determining predictability, the following were observed: ASTM D4737-87 exhibited a tendency to overpredict and did not appear to be an improvement over ASTM D976-80; both the NRCC and the CGSB cetane indices exhibited a tendency to underpredict; and a modified CCAI equation appeared promising as a predictor of cetane number.
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